Abstract
Cann et al. (e02296-19) provide a detailed analysis of the hemicellulase gene repertoire of two thermophilic bacterial species, Caldanaerobius polysaccharolyticus (optimum temperature, 68°C) and Caldicellulosiruptor bescii (optimum temperature, 80°C). The two bacterial strains have evolved similar sets of enzymes, although deployed differently, that act synergistically to deconstruct purified polysaccharide substrates such as arabinan, mannan, and xylan that comprise a major part of the hemicellulose present in the plant cell wall of lignocellulosic biomass. Thermostable enzymes are associated with significant properties such as accelerated reaction rates, solubility, and resistance to denaturation. These enzymes have wide application in the biofuel and animal enzyme industries.
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